If a metallic wire of cross-sectional area 4.0 × 10^?6 m2 carries a current of 7.0 A and has a mobile charge density of 4.24 × 10^28 carriers/m3, what is the average drift velocity of the mobile charge carriers? (charge value = 1.6 × 10^?19 C)
a. 1.8E+3 m/s
b. 1.7E+3 m/s
c. 4.1E–4 m/s
d. 2.6E–4 m/s
e. 7.0E–6 m/s
d
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Which of the following ions is isoelectronic with a neon atom?
a. N3- b. Li+ c. Cl- d. F2-
A shot-putter moves his arm and the 6.00-kg shot through a distance of 1.25 m, giving the shot a velocity of 8.20 m/s from rest. Find the average force exerted on the shot during this time
a. 323 N b. 161 N c. 118 N d. 12.7 N e. 252 N
Electrons are used to produce X-rays by allowing a beam of electrons to strike a heavy metal surface. When the speeds of the electrons in the beam is increased, this results in:
A. X-rays being produced having higher energies B. X-rays having longer wavelengths being produced C. Faster X-rays being produced D. More X-rays being produced per unit time
This holographic image shows the vibrations in the body of a violin. The sound that reaches your ears from a violin:
a. comes from the air motion directly caused by the vibrating strings. b. results from the resonant motion of sound box of the violin and the air molecules within it. c. comes from a speaker system attached to an amplifier in the violin. d. comes from the violin bow. e. the small bridge that slightly elevates the violin strings above the sound box.